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Equity - Statements of Equity with dividends per share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Balance at beginning of period   $ 2,972     $ 2,972  
Balance at end of period $ 2,844   $ 27   2,844 $ 27
Dividends declared, common stock (in dollars per share) $ 0.64 $ 0.64 $ 0.63 $ 0.63    
Common Stock            
Balance at beginning of period $ 1 $ 1 $ 1 $ 1 1 1
Balance at end of period 1 1 1 1 1 1
Additional Paid-in Capital            
Balance at beginning of period 1,155 1,150 1,142 1,137 1,150 1,137
Share-based compensation, net of issuance (1) 5 1 5 4 6
Balance at end of period 1,154 1,155 1,143 1,142 1,154 1,143
Treasury Stock            
Balance at beginning of period (1,022) (1,024) (1,028) (1,040) (1,024) (1,040)
Repurchases of common stock, net (10) (14)     (24)  
Share-based compensation, net of issuance 3 16 1 12 19 13
Balance at end of period (1,029) (1,022) (1,027) (1,028) (1,029) (1,027)
Accumulated Other Comprehensive Loss            
Balance at beginning of period (1,164) (1,133) (1,322) (1,158) (1,133) (1,158)
Other comprehensive (loss) income 58 (31) 15 (164) 27 (149)
Balance at end of period (1,106) (1,164) (1,307) (1,322) (1,106) (1,307)
Retained Earnings            
Balance at beginning of period 3,667 3,957 3,813 3,780 3,957 3,780
Net income 178 (246) 66 75 (68) 141
Dividends declared, common stock (43) (44) (43) (42) (87) (85)
Balance at end of period 3,802 3,667 3,836 3,813 3,802 3,836
Non-Redeemable Non-Controlling Interests            
Balance at beginning of period 26 21 21 21 21 21
Net income 3 4 1 3 7 4
Dividends declared, common stock (7)   (3)   (7) (3)
Other comprehensive (loss) income   1 1 (3) 1 (2)
Balance at end of period $ 22 $ 26 $ 20 $ 21 $ 22 $ 20